Daily Fine Particulate Matter Levels
The measures presented here can be used to inform the public and policy makers of the degree of potential exposures within a state during a year.
The daily National Ambient Air Quality Standards (NAAQS) for Fine Particulate Matter (PM2.5) is 35 micrograms per cubic meter (mcg/m^3).
Person-days are units for a population-weighted measure to estimate the exposure to high levels of PM2.5 at the county level. Person-days are highly influenced by county populations. If two counties have the same number of days above the NAAQS, and one of the counties has a much larger population, that county will have more person-days above the NAAQS.
Measure Description:
- Percent of days with PM2.5 levels over the daily NAAQS of 35 mcg/m^3
- Number of person-days with PM2.5 over the daily NAAQS of 35 mcg/m^3
View daily fine particulate matter levels data visualization
Annual Average Concentration of Fine Particulate Matter
The annual average concentration provides an indication of the long-term trends in the burden of Fine Particulate Matter (PM2.5).
The annual National Ambient Air Quality Standards (NAAQS) for concentration of PM2.5 is 12 micrograms per cubic meter (mcg/m^3). Prior to 2013 the standard was 15 mcg/m^3.
The percentage of the population living in counties that exceed the NAAQS provides an indication of the population at risk for long-term exposure to PM2.5.
Measure Description:
- Annual average ambient concentrations of PM2.5 in micrograms per cubic meter (mcg/m^3)
- Proportion of the population with
- PM2.5 monitors in county and annual average ambient concentrations over the annual NAAQS
- PM2.5 monitors in county and annual average ambient concentrations below the annual NAAQS
- No PM2.5 monitors in county
View annual average concentration of fine particulate matter data visualization